Sawmill set-works.



No. 673,493. Patented May 7, I90l. W. F. BROWN.

SAWMILL SET WORKS.

(Application-filed Sept. 21, 1900.)

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No. 673,493. Pafented May 7, IQUL w. F. BROWN.

7 SAWMILL SET WORKS. (Appliation filed Sept. 21, @906.)

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SAWMILL SET WORKS...

(Application filed Sept. 21, IDOOJ Patented May 7, l90l.

(No Model.)

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- W. F. BROWN. SAWMILL SET WORKS.

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Patented May 7, l90l.

l I w. F. BROWN.

- SAWMILL SET WORKS.

(Applic'ation filed Sept 21, 1900.) v w (No Model.) 5 Sheets8hqet 5.

UNITED STATES;

PATENT FFICE.

SAWMILL SET-WORKS.

SPECIFICATION forming part of Letters Patent No. 673,493, dated May '7, 1901.

Application filed September 21, 1900. Serial No- 30,681. (No model.)

T0 to whom, it may concern:

Be it known that I, WALTER F. BROWN, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of \Visconsin, have invented certain new and useful Improvements in Sawmill Set-Works, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof. 7

The main objects of my invention are to prevent overthrow of the knees or standards in the operation of the set-works, particularly in handling small logs or light lumber, and thus avoid uncertainty of operation and inaccuracy of work, to dispense with check cylinders and pistons heretofore employed in power set-works for preventing overthrow of the knees or standards, to adapt a spring-motor having an automatic winding connection with acarriage wheel or truck to operate the set-works, and generally to improve the construction and operation of power set-works.

The invention consists in certain novel features of construction and in the arrangement and combinations of parts hereinafter particularly described, and pointed out in the claims. y

In the accompanying drawings like characters designate the same parts in the several figures.

Figure 1 is a vertical cross-section of a sawmill-carriage, showing a preferred form of my improved set-works as applied thereto. Fig. 2 is a plan view of a portion of the carriage and set-works, certain parts of the set-works being broken away to disclose underlying parts. Fig. 3 is a rear elevation as viewed from the left with reference to Fig. 1. Fig. 4 is an enlarged vertical cross-section on the line 4 4, Fig. 3, showing in detail the releasing mechanism of the spring-motor and the arrangement of the connections between it and the rock-shaft for preventing overthrow and varying the movement of the standards for cutting lumber of different dimensions. Fig. 5 is a similar section on the line 5 5, Fig. 3, of the releasing mechanism. Figs. 6 and 7 are longitudinal sections of the releasing mechanism, the plane of Fig. 7' being indicated by the line 7 7 on Fig. 6; and Fig. 8 is a vertical section and elevation of a modified form'of the set-works in which afluid-pressure motor is substituted for the spring-motor.

Referring to Figs. 1, 2, and 3, A designates the carriage-frame; B, one of the head-blocks; 0, one of the knees or standards, and D the set-shaft, provided with pinions d, which engage with racks on the knees or standards for moving them upon the head-blocks toward and from the saw-line.

E is a ratchet-wheel. mounted on the setshaft, and F represents vibrating pawl-carriers provided with pawls ff, which engage with the ratchet-wheel andare connected by links g g with a cross-head or oppositely-projecting arms G G on a rock-shaft H, parallel with the shaft D and corresponding with the lever-shaft of the ordinary hand-operated setworks.

In place of the ratchet-wheel and pawls and pawl-carriers for operating the set-shaft any other suitable form of intermittent grip mechanism may be employed.

As the preferred means for operating the set-works I have shown a spring-motor consisting of two spiral springs I I, mounted upon parallel shafts J J, which are supported in suitable bearings crosswise of the carriage,

as seen in Fig. 2. These springs are attached at one end to intermeshing gears jj, loosely mounted upon said shafts J. At the opposite end one of said springs is attached, to a collar i, fixed on one of said shafts, and the other spring is attached to a bevel-gear K, loosely mounted on the other shaft. Upon the rear end of the shaft J, which has the collar i, a ratchet-wheel L is fixed. This ratchet wheel is held against backward rotation, so as to prevent the unwinding of the springs I, by a dog Z, pivoted to the carriage-frame, andv it is turned forward, so as to wind and strain the springs, by a pawlm, pivoted to a vibrating arm M, which is loosely mounted upon the shaft J next to the ratchet-wheel L. The

arm M is connected by a rod N with a crankpin on one of the carriage-wheels O. The attachment of this rod to said arm is made adjustable, so as to vary the throw of the arm, and the connection with the crank-pin on the carriage-wheel is arranged to yield against the tensionof a spring n, so that when the springs I are wound and strained to the desired limit the rotation of the carriage-wheel 0 will compress the spring 41 without moving the pawl m sufficiently to turn the ratchetwheel L.

ThegearKmeshes with a similar gear P on the lower end of a vertical shaft 1:), which is provided at its upper end with a bevel-gear Q, meshing with a similar gear R on a horizontal shaft 1', parallel-with the rock-shaft H. The shaft 1" is provided with two frictionwheels S S. Each of these friction-wheels is provided with a brake-band t, which is attached at one end to a fixed part of the frame and atthe other end to a crank-arm T on a rock-shaft provided with a hand-leverU and a grooved cam u, as shown by Figs. 4, 5, 6, and 7 in connection with Figs. 1 and 3.

V is a reciprocating bar supported in suitable bearings parallel with the shaft o and provided with a pin'and roller 1;, which engages with the groove of cam M. This bar is adapted to engage at the ends with radial projections or lugs s s on the friction-wheels S. The projections or lugs s s are arranged on opposite sides of the shaft '1', and the bar V is made of such length that it will engage with but one of them at atime. The groove in cam it has a straight portion at each end, as shown in Fig. 7, so that the lever U may be moved after shifting the bar V in either direction to tighten or loosen either of the brake-bands t on the associated friction-wheel -S without affecting said bar.

The friction-wheel S at the end of the shaft '1' opposite the gear Ris provided with a crankpin, which is connected by a link U) with one end of a lever W, the opposite end of which is pivoted to a crank 77. of the rock-shaft H.

' X is an adjustable fulcrum -block, upon which the lever W is mounted between its ends. It is pivoted upon a pin 50, which connects two slides Y, guided in grooved ways in the frame on opposite'sides of the lever N. The slides Y are connected by links y with a lever Z, which has a spring-latch 2, adapted to engage with a segment a, and thus hold the fulcrum-block X in various positions for sawing lumber of different dimensions.

Myim proved set-works, as hereinbefore described, operates as follows: As the carriage is run back and forth the wheel 0 through its pawl-and-ratchet connection with the springmotor winds and strains the springs I I, storing in them sufficient power to operate the set-works. The knees or standards having been withdrawn and a log or piece of timber to be sawed having been placed upon thehe ad-blocks and secured to said standards in the usual way, the standards are moved toward the saw-line by rocking the lever U forward and back. Each forward or backward movement of the lever U shifts the lockingbar V out of engagement with the projection or lug s on'one of the friction-wheels S into position to engage with the projection or lug on the other friction-wheel. When either friction-wheel is thus released, it is turned forward by the spring-motor through the connections hereinbefore described half of a revolution, such movement being checked and controlled by tightening one or the other of the brake-bands t uponthe associated friction-wheel by means of'the same lever U which is employed to work the locking-bar V. The crank-pin on one of the connected friction-wheels S turning a half-revolution rocks the lever W on its fulcrum-block X, rocks the shaft I-I through the crank h, and advances one of the pawl-carriers F, while it withdraws the other pawl-carrier a corresponding interval. The set-shaft is thus turned and the knees or standards 0, with the log or piece of timber attached thereto, are advanced an interval, greater or less according to the adj ustmentof the fulcrum-block X. The crankpin with which the rod W is connected is so located with reference to the lugs s on the frictionwvheels and the locking-bar V that it will be stopped at dead-centers or at'the limits of the movement of the lever W. By reason of this arrangement of parts the movement of the lever W is retarded as it approaches its limit and as the crank-pin on the friction-wheel S comes to a dead-center, and the movement of said crank-pin a limited distance beyondits dead-center will produce no appreciable movement of said lever. The standards 0, with the log or timber attached thereto, being thus brought to a gradual step are prevented from being carried by their momentum beyond the limits at which they should come to rest. Uncertainty in the op eration of the set-works and inaccuracy of work are avoided without employing a check cylinder and piston or a positive adjustable stop, such as have been employed in and are essential to the practical operation of power set-works as generally constructed heretofore.

The construction and arrangement hereinbefore described of the power-transmitting mechanism for preventing overthrow of the knees or standards may be advantageously employed with other than spring-motors. In Fig. 8 I have shown such mechanism in connection with the cylinder and piston of a fluidpressure motor. In this form of the apparatus the piston-rod of the motor may be connected with the crank which actuates the lever W by means of a rack 1 and gear 2. gear is made of such a size that a s'ingle'stroke of the piston will turn it half a revolution. The crank-pin is arranged, as in the other form of set-works, to stop on dead-centers at the limits of the piston-stroke. The supply and release of the fluid-actuating medium to the motor-cylinder are controlled by a valve 3, which is operated by a lever 4.

Various changes in the details of the apparatus may be made within the spirit and intended scope of my invention.

I claim- 1. In sawmill set-works, the combination with the set-shaft and a motor for operating the same, of power-transmitting connections The I two connected parts, one of which is turned by the motor at intermittently-regular intervals and impart-s to the other and through it to the set-shaft an acceleratinginitial movement followed by a retarded final movement, substantially as set forth.

2. In sawmill set-works the combination with the set-shaft and a motor for operating the same, of power-transmitting connections between said motor and set-shaft comprising a rotary part connected with the motor so as to be turned thereby at intermittently-regular intervals, and an oscillatory part con nected with the set-shaft'and with said rotary part, so as to receive from the rotary part and impart to the set-shaft an accelerating initial movement and a retarded final movement, substantially as set forth.

3. In sawmill set-works, the combination with the set-shaft of a driving member, means adapted to turn said driving member intermittently at an approximately uniform rate of speed, a driven member connected with the set-shaft, and a connection with the driving member constructed and arranged to start andstop the driven member with an accelerating and a retarded movement at predetermined limits irrespective of variation in the limits of movement of the driving member, substantially as set forth.

4. In sawmill set-works the combination with the standards and set-shaft, of a motor and power-transmitting mechanism connecting the motor with the set-shaft and compris 'ing a driving member connected with the motor so as to be moved intermittently at an approximately uniform rate of speed, and a driven member connected with said driving member so as to start with an accelerating and stop with a retarded movement, while the driving member moves at a uniform rate of speed, substantially as set forth.

5. In sawmill set-works, the combination with the set-shaft and a rock-shaft connected therewith, of a crank connected with said rock-shaft and means adapted to turn said crank a definite distance and to stop the same approximately on a dead-center, substantially as set forth.

6. In sawmill set-works, the combination with the set-shaft and a rock-shaft connected therewith, of a crank having an adjustable actuating connection with said rock-shaft and means for turning said crank a definite distance and stopping it approximately on a dead-center, substantially as set forth.

7. In sawmill set-works, the combination with the set-shaft of a rock-shaft connected therewith and provided with a crank, an actnating-crank,and a lever pivoted to the crank on said rock-shaft and connected by a link with said actuating-crank, substantially as setforth.

8. In sawmill set-works, the combination with the set-shaft of a rock-shaft connected therewith and provided with a crank, an actuating-crank, and a lever having an adjustable fulcrum and connected with said cranks, substantially as set forth.

In sawmill set-works, the combination with the standards and set-shaft, of a rockshaft having an intermittent grip connection with the set-shaft, a crank having a powertransmitting connection with said rock-shaft and a motor connected with said crank so as to turn ita definite distance and cause it to come to rest on a dead-center, substantially as set forth. 7

10. In sawmill set-works, the combination with the standards and set-shaft, of a rockshaft havinga crank and an intermittent grip connection for turning the set-shaft, an actuating crank, a motor having connections adapted to turn said crank intermittently a certain distance, and a lever having an adjustable fulcrum and connected with the crank on the rock-shaft and with the actuating-crank, substantially as set forth.

11. In sawmill set-works, the combination with the set-shaft of a rock-shaft connected therewith and provided with a crank, an actuating-crank, a motor having connections adapted toturn said crank intermittently a definite distance, an adjustable fulcrumblock, a lever mounted upon said block and connected with said cranks, and means for adjusting said fulcrum-block, substantially as set forth.

12. In sawmill set-works, the combination with the set-shaft of a rock-shaft connected therewith and provided with a crank, an actuating-crank, a motor having connections adapted to turn said crank intermittently a definite distance, slides connected by a crosspin and guided by parallel ways, a fulcrumblock pivoted on said cross-pin, a lever mounted upon said fulcrum-block and connected with said cranks, and an adj usting-lever connected with said slides, substantially as set forth.

13. In sawmill set-works the combination with the set-shaft, standards and a motor, of a lever having an adjustable fulcrum and connections with said set-shaft and motor where by the movement of the standards may be varied for cutting lumber of different dimensions without variation in the extent of movement of the motor, substantially as set forth.

14. In sawmill set-works, the combination of a spring-motor and stop and releasing mechanism for applying the power of the motor to the operation of the set-works, such mechanism comprising a rotary shaft having an actuating connection with the motor and provided with two diametrically arranged stops, a reciprocating locking and releasing bar adapted to engage with said stops-one at a time, and means for manually operating said bar, substantially as set forth.

15. In sawmill set-Works, the combination of a spring-motor and stop and releasing mechanism adapted to apply the stored power of said motor to the operation of the setworks and comprising a rotary shaft having IIO diametricallyarranged stops, a longitudinally-m ovable bar adapted to en gage with one of said stops at a time, a lever for operating said bar, and means operated by said lever for checking and controlling the movement of said shaft when said bar is disengaged from either stop, substantially as set forth.

16. In sawmill set-Works, the combination of a spring-motor and stop and releasing mechanism adapted to apply the stored power of said motor to the operation of the set-Works, and comprising two connected friction-wh eels having an actuating connection with the motor and provided with diametrically opposite stops, a sliding bar adapted to be engaged with said stops one after the other, a lever having an operating connection with said bar, and brake-straps connected with said lever and adapted to be tightened and loosened upon said friction-wheels by said lever at or near the limits of its movement for shifting said bar, substantially as set forth.

17. In sawmill-set-Works, the combination with the standards and set-shaft, of a motor and an adjustable actuating connection between the motor and set-shaft, whereby the movement of the standards may be varied Without variation in the movement of the m0- tor, substantially as set forth.

In Witness whereof I hereto affix my signature in presence of two Witnesses.

WALTER BROWN.

Witnesses:

HERBERT L. ROLOFF, CHAS. L. Goss. 

